Abstract
Phasematch curves as well as sensitivity to angular and wavelength misalignment for generation of second-harmonic of 785 nm and 810 nm in Bi(3)BO(6) crystal was calculated. Measurements were done for intra-cavity CW SHG in a Ti:Sapphire laser. The BiBO crystal was found to be excellent for this application. Temperature dependance was uncritical for both crystals, while power stability was good. Maximum blue output was 53 mW at 392 nm and 100 mW at 405 nm; corresponding to pump-to-blue optical conversion efficiencies of 0.96% and 1.82% respectively.
Highlights
There is a great demand for coherent light sources in the blue (450-400 nm) to UVA (400320 nm) spectral region
One of the options is doubling Ti:Sapphire lasers, with the possibility of spanning wavelengths from around 325 nm to 525 nm. The scope of this experiment was to test the novel non-linear crystal BiB3O6 (BiBO) in conjunction with frequency doubling of Ti:Sapphire lasers
The BiBO crystal excels by having very high non-linear coefficient – higher than commonly used crystal for frequency doubling to the UV region [1]
Summary
There is a great demand for coherent light sources in the blue (450-400 nm) to UVA (400320 nm) spectral region. Applications include semiconductor processing, microscopy, and medico technical equipment Today this spectral region is usually addressed by frequency tripled Nd:YAG lasers, excimer lasers, or gas lasers. These options only cover a limited number of wavelengths, and it would be preferable to increase the number available. The best result for intra-cavity doubling of Ti:Sapphire so far [11] was achieved utilising periodically poled lithium niobate crystals in a uni-directional ring laser to generate 114 mW of power at 403 nm with 4.2 W pump incident at the crystal. To the best of our knowledge there has been no published references on intra-cavity doubling of CW Ti:Sapphire laser systems utilising BiBO crystal as the non-linear intra-cavity frequency conversion media, except our own [12] where initial results were presented. Maximum blue output was found to be 53 mW at 392 nm and 100 mW at 405 nm; corresponding to pump-to-blue optical conversion efficiencies of 0.96% and 1.82% respectively
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